Contains among other things: "The most common abbreviations in England", 1908; Treaty on Landing in Swakopmund, o.Dat.

1925-1960 in Okahandja, Gobabis, Karibib; curriculum vitae (3 versions), testimonies, 1914-1915; letters from the internment camp Andalusia, 1940-1945; "Our faithful farm workers should be the refuge", dedication of the native church in Frieden-au, Windhoeker "Allgemeine Zeitung", no. 53, 1959

1890-1930 in Ondjiva, Omupanda, Karibib, Swakopmund, Präses d. Ovambomission, estate see RMG 1.627; extensive correspondence, annual, station and travel reports, 1890-1936; travel report by Thusnelda Wulfhorst, née. Härlin, 1892; Private letters from August and Thusnelda Wulfhorst, née Härlin to Inspector Johannes Wilhelm Karl Spiecker, 1890-1900; "Osondahe", Monatsblatt d. Finnish Mission, May 1909; Correspondence with the German Consulate and Portuguese authorities concerning property claims in Omupanda, 1920-1927; Obituary for August Wulfhorst by Johannes Georg Heinrich Olpp, 1936; Correspondence with his 2nd wife, Johanna Wulfhorst, née Härlin, 1937-1956